Setsu Yamaguchi

This Japanese thriller finds a sexy policewoman becoming entangled in Japan's S&M underground while investigating a gruesome murder. Soon, her investigation has led her to a seductive sadist and his equally appealing masochist victim. Falling prey to her suspects' powerful allure, she struggles to extricate herself from an increasingly torrid affair to solve the mystery she set out to investigate.

4th Entry in a Four-Part-Series, following the success of the original XX-series with 7 parts: In this one Yoko is an undercover cop infiltrating the chinese mafia

Kiryu Mamoru, a subordinate boss of the Tomogashira Group, earns a living through the shady business of "yamikin" or underground lending. He preys on desperate customers who cannot get loans from legitimate lenders, charging exorbitant interest rates of 30% in 10 days or even 90% in some cases, in violation of the law. With the backing of his yakuza group, he employs extremely vicious and unethical methods...

Two brothers are plunged into the realm of psychic horror, one tormented by a stalker, and the other involved with a girl whose home is the site of eerie occurrences.